2019 Opus Bike Spark 4

	XXS	XS	S	M	L	XL
Stack	533mm	550mm	565mm	582mm	598mm	617mm
Reach	362mm	363mm	370mm	377mm	385mm	390mm
Stack to Reach Ratio	1.47:1	1.52:1	1.53:1	1.54:1	1.55:1	1.58:1
Seat Tube Length, Unknown	470mm	500mm	520mm	540mm	560mm	580mm
Top Tube Length, Effective/Horizontal Unknown	510mm	520mm	537mm	555mm	573mm	590mm
Top Tube Slope	9.3deg	7.9deg	7.3deg	7deg	6.6deg	6.6deg
Head Tube Angle	70.5deg	71deg	71.5deg	72deg	72.5deg	72.5deg
Seat Tube Angle	74.5deg	74deg	73.5deg	73deg	72.5deg	72deg
Head Tube Length	114mm	129mm	144mm	159mm	174mm	194mm
Bottom Bracket Drop	68mm	68mm	68mm	68mm	68mm	68mm
Bottom Bracket Height	276mm	276mm	276mm	276mm	276mm	276mm
Chainstay Length	435mm	435mm	435mm	435mm	435mm	435mm
Chainstay Length Horizontal	429.7mm	429.7mm	429.7mm	429.7mm	429.7mm	429.7mm
Trail	— —	— —	— —	— —	— —	— —
Mechanical Trail	—	—	—	—	—	—
Wheel Flop	—	—	—	—	—	—
Standover Height	772mm	792mm	811mm	830mm	848mm	869mm
Pedal Spindle to Ground Clearance	111mm 165 mm cranks	106mm 170 mm cranks	106mm 170 mm cranks	101mm 175 mm cranks	101mm 175 mm cranks	101mm 175 mm cranks

	XXS	XS	S	M	L	XL
Wheel Size	700C/29 in 622 mm BSD	700C/29 in 622 mm BSD	700C/29 in 622 mm BSD	700C/29 in 622 mm BSD	700C/29 in 622 mm BSD	700C/29 in 622 mm BSD
Tire Width	33mm	33mm	33mm	33mm	33mm	33mm
Tire Outer Diameter	688mm	688mm	688mm	688mm	688mm	688mm
Crank Length	165mm	170mm	170mm	175mm	175mm	175mm
Handlebar Width	380mm	400mm	420mm	420mm	440mm	460mm
Stem Length	80mm	90mm	100mm	100mm	110mm	110mm

Very Upright

Somewhat Upright

Average

Somewhat Aggressive

Very Aggressive

The Bike Insights Upright/Aggressive scale is based on analysis of a bike’s proportions relative to similar sized bikes in the same category.

Category Trend

Source:https://www.opusbike.com/en/product/adventure/169-spark-4.html?CouleurId=163

Geometry